Primary and system protection for an electric power delivery system

Abstract

Primary protection relays and an integrator disclosed for providing primary protection and secondary applications for an electric power delivery system. The primary protection relays obtain signals from, and provide primary protection operations for the power system, and may operate independently from the integrator. An integrator receives signals and status communications from the primary protection relays to perform secondary applications for the electric power delivery system. The secondary applications may include backup protection, system protection, interconnected protection, and automation functions.

What is claimed is: 
     
       1. An integrator device for protection of an electric power delivery system, the integrator device comprising:
 a first input for receiving electric power delivery system signals and primary protection status from a first primary protection relay protecting a first portion of the electric power delivery system; 
 a processor; 
 a computer-readable storage medium that comprises computer instructions that when executed cause the integrator device to:
 determine an electric power delivery system condition using the electric power delivery system signals and primary protection status from the first primary protection relay, wherein the primary protection status comprises an open signal for a first circuit breaker of the first portion of the electric power delivery system; 
 compare the electric power delivery system condition with a predetermined threshold; 
 when the electric power delivery system condition is outside of the threshold, determine a backup protection function for the first primary protection relay, wherein the backup protection function comprises an open signal for a second circuit breaker; and, 
 issue a backup protection command to a second primary protection relay protecting a second portion of the electric power delivery system, the backup protection command to open the second circuit breaker of the second portion of the electric power delivery system, the backup protection command corresponding with the determined backup protection function for operation by the electric power delivery system to affect the first portion and the second portion of the electric power delivery system. 
 
 
     
     
       2. The integrator device of  claim 1 , further comprising a second input for receiving electric power delivery system signals and primary protection status from a second primary protection relay. 
     
     
       3. The integrator device of  claim 1 , wherein the backup protection command comprises a redundant backup protection command. 
     
     
       4. The integrator device of  claim 1 , wherein the backup protection command comprises a time delay to allow the primary protection relay to take a protective action prior to execution of the backup protection function. 
     
     
       5. The integrator device of  claim 1 , wherein the backup protection function comprises a bus backup protection function. 
     
     
       6. The integrator device of  claim 1 , wherein the backup protection function comprises a feeder backup application. 
     
     
       7. The integrator device of  claim 1 , wherein the backup protection function comprises a transformer backup application. 
     
     
       8. The integrator device of  claim 1 , wherein the backup protection function comprises a breaker failure application, and the command comprises opening a specified breaker of the electric power delivery system to remove power from a faulted feeder that includes a failed breaker. 
     
     
       9. The integrator device of  claim 1 , wherein the computer instructions further cause the integrator device to:
 resample and time align the electric power delivery system signals from the first primary protection relay and a second primary protection relay, and 
 use the resampled and time aligned electric power delivery system signals in determining the electric power system condition. 
 
     
     
       10. The integrator device of  claim 1 , wherein:
 the backup protection command is issued upon persistence of the determined electric power delivery system condition outside of the threshold. 
 
     
     
       11. The integrator device of  claim 10 , wherein the backup protection command is issued after a time delay and persistence of the determined electric power delivery system condition outside of the threshold.